FACILITY CONTROL SYSTEM

PROBLEM TO BE SOLVED: To provide a facility control system capable of determining devices which serve as a control source in a facility controller even if a plurality of devices which issue control information are connected to the facility controller in the system.SOLUTION: A core unit (facility controller) 2 comprises: a start/stop signal output unit 2c which outputs a start/stop signal to an air conditioner 6 on the basis of control information; a start/stop failure determination processing unit 2d which determines that start/stop is unsuccessful when control contents of the start/stop signal do not match a state signal acquired from the air conditioner 6 within a monitoring time; a device determination unit 2e which determines a device serving as a control source which issued the control information; and a transmitting/receiving unit 2b which receives the control information and transmits an alarm signal to the device which serves as the control source. This configuration allows the core unit 2 to determine devices which serve as the control source such as a central monitoring device 1 and a hand setter 8 even if a plurality of devices which serve as the control source are connected to the core unit 2.